Full Description

Legacy Network Gateway Generic Requirements

ABSTRACT: GR-3162-CORE provides generic requirements for a Legacy Network Gateway to support the routing of 9-1-1 calls that originate in the
legacy wireline or wireless networks to IP-enabled (i3) Public Safety Answering Points (PSAPs) via Emergency Services IP Networks
(ESInets). This document includes:

Functional requirements for the Legacy Network Gateway to support signaling gateway functionality

Functional requirements for the Legacy Network Gateway to support trunk/media gateway functionality

Functional requirements for the Legacy Network Gateway to support location retrieval

Functional requirements for the Legacy Network Gateway to support routing determination

Functional requirements for the Legacy Network Gateway to support location de-referencing

Functional requirements for the Legacy Network Gateway to support an Additional Data Structure and the references and interface to
access that data

Signaling/Interface Requirements

Operations, Maintenance, and Performance Requirements.

This GR is the only publicly available document that fully describes the functionality, interfaces, and operations requirements
associated with a Legacy Network Gateway. Some high-level requirements are provided in various NENA documents, including the Stage 2
NENA i3 standard (NENA 08-002) and the Stage 3 standard (NENA 08-003); however, these documents do not include everything necessary for
a complete specification of a Legacy Network Gateway system.

This document is being reissued to reflect changes to the definition of the Legacy Network Gateway that are under consideration for
Version 2 of NENA 08-003. Specifically, this update includes the following changes:

Updates to the mechanism used by the Legacy Network Gateway to derive routing location

Clarification of the relationship between the Legacy Network Gateway and legacy Wireless Service Providers/providers of MPCs/GMLCs
as the means by which display location is acquired by the Legacy Network Gateway

Updates to the interface requirements associated with the de-referencing interface between the Legacy Network Gateway and other i3
functional elements/i3 PSAPs

Support for delivery of Additional Data Associated with a Call "by value" and/or "by reference."